Tire retreading apparatus



Dec. 17,' 1935. H, 1 SHAW 2,024,888

TIRE RETREADING APPARATUS Filed Jan. 28, 1935 2 SheetsLSheet l a Zo wlTNr-:ss ATTORNEY Dec. 17, 1935. H L. SHAW TIRE RETREADING APPARATUS Filed Jan. 28. 1935 '2 sheets-sheet 2 jjowarc L.

BY myfw@ ATTORNEY WITNESS Patented Dec. 17, 1935 UNITED STATES PATENT OFFICE 3 Claims.

The invention relates to a tire retreading apparatus and more especially to a retread vulcanizer. Y f

The primary object of the invention is the provision of an apparatus of this character, wherein through the use of a full circle die and matrices, a tire shoe or casing can be conveniently retread yby curing of the rubber through vulcanization, the assembly of the parts of the apparatus being novel for convenient insertion of the tire shoe or casing and for removal thereof.

Another object of the invention is the provision of an apparatus of this character, wherein the 'matrix members are susceptible of. a determined range of adjustment to accommodate therebetween tire shoes or casings of different sizes for retreading purposes.

A further object oi the invention is the provision of an apparatus of this character, which is extremely simple in its construction, thoroughly reliable and eicient in its operation, possessing but few parts, yet being strong, durable, readily and easily handled, and inexpensive to manufacture and install.

With these and other objects in View, the invention consists in the features of construction, combination and arrangement of parts as will be hereinafter more fully described in detail, illustrated in the accompanying drawings, which disclose the preferred embodiment of. the invention, and pointed out in the claims hereunto appended.

In the accompanying drawings:

Figure l is a vertical sectional View through a vulcanizing apparatus constructed in accordance with the invention, showing a tire therein for retreading of the same.

Figure 2 is a top plan View of the vulcanizer.

Figure 3 is a fragmentary detail sectional View through the apparatus on the line 3-3 of Figure 2, showing a part elevation of the tread die and the relationship of the matrices thereto.

Figure 4 is a fragmentary sectional View showing a slight modiiication.

Similar reference characters indicate corresponding parts throughout the several views 1n the drawings.

Referring to the drawings in detail, A designates suitable supporting legs which carry the main annular frame lli which, in this instance, is a circular band presenting a vertical wall. Fixed interiorly of this frame I is a tread die I I which is of full circular formation having the design face I2 for ornamentation ci the retread area of a tire shoe or casing I3 on vulcanizing of the same within the apparatus. The die II is held in place by rivets l upon the frame I0 and these rivets have the round heads I5 which augment the design formation as created in the retread area of the tire i3 by the die I I. The rivets 5 l@ engage in the frame so that the die I I is iixedly held therewith.

Above and below the die l I and removably contained in the frame iii are the upper and lower matrices I6 and Il', respectively, these having the 10 work-engaging faces i3 and being susceptible of a wide range of adjustment so that there can be accommodated therebetween tires of different sizes. Each matrix i5 is of. annular form and transversely split, at I9, which latter accommodates a filler or wedge 2li to close the gap as constituted by the split when the matrix is in use and iitted within the frame Ill for the vulcanization period in retreading the tire I3.

The legs A at their upper ends are of bracket formation, as at 2|, where they carry adjusting screws Z2 coacting with a plural armed lower spider 23, its arms carrying contact blocks 24 engageable by the matrix I'I next to this lower spider. The upper matrix IB has the upper spider 25 25 similar to the lower spider 23 superimposed and with its contact blocks 23 resting upon said matrix. These spiders 23 are constituted with center hubs 2l for receiving a headed tie bolt 28 carrying a nut 29 threaded thereon 30 Externally of the frame lil and disposed concentrically about the same is a housing 30 providing a heat chamber 3l and within the latter is a burner ring 32 for the heating of said chamber, the bottom of the housing being provided 35 with air ports or' vents33 and the outer wall of said housing at its inner face being augmented by an insulation or heat resisting lining 34 so that heat will radiate through the frame II) for the heating ofthe die il for Vulcanization in the 4.0 process of retreading the tire I3 in the use of the apparatus. 'I'he burner ring 32 is seated upon holding arms 35 as carried by the legs A.

In Figure 4 of the drawings there is shown a. slight modication of the invention and therein the housing 35 coniines a steam coil 31 therein which is embedded in a filler 38 occupying the chamber as created by the housing 35. The top, bottom and outer walls of this housing at their inner surfaces are covered with a heat resisting lining 39 to assure heat radiation through the main frame and inwardly thereof ci the apparatus.

Of course, it is to be understood that the heat responsive means may be varied, altered or changed as the apparatus can be electrically heated or otherwise, the adjustment of the matrices I 6 and Il being important to have the apparatus accommodate varying sizes of tires so that they may be retreaded by vulcanization, the rubber of the retread area being cured by heat.

The design or ornamentation oi.' the die I I may be varied according to the fancy of the user of the apparatus and the design face I2 is merely an example.

What is claimed is:

Vl. An apparatus of the character described `comprising a main full circular frame, a Iull `circular die fitted within the frame, split annular matrices above and below said die, spiders acting against'the matrices and having contact blocks engaged therewith, tie means connecting the spiders, and a heating element concentrically of the frame and a part thereof.

2. An, apparatus of the character described comprising a main full circular frame, a full circular die' tted Within the frame, split annular matrices above and below said die, spiders acting against the matrices and having contact blocks engaged therewith, tie means connecting the spiders, a heating element concentrically of the frame and a part thereof, supporting legs for the frame, and adjustable means carried by the 5 supporting legs and engaged by the lowermost spider for permitting adjustment of the matrix next thereto.

3. An apparatus of the character described comprising a main full circular frame, a full cir- 10 cular die fitted Within t-he frame,Y split annular matrices above and below said die, spiders acting against the matrices and having contact blocks engaged therewith, tie means connecting the spiders, a heating element concentrically of the 15 frame and a part thereof, supporting legs for the frame, adjustable means carried by the supporting legs and engaged by the lowermost spider for permitting adjustment of the matrix next thereto, and heat resisting insulation outermost with re- 20 spect to said heating element for radiation of heat inwardly of said frame.

HOWARD L. SHAW. 

